^^Like he said. It's pretty much normal for it to do that at full lock when you are standing still. I wouldn't worry about it, especially with a car 15+ years old. There shouldn't be that many times when you do that anyways.
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog